Telephone instrument



Jan. 27, '1925. 1,524,z7&

' F. .H. ALDER TELEPHONE LNSTRUMENT Filed Jan. l0 19123 Z Sheets-Sheet 1 Jan. 27, l925.

F. H. ALDER TELEPHONE INSTRUMENT Fned Jan. 1o, 1923V 2 Sheets-Sheet 2 Patented Jan. 27, 1925.

UNITED STATES PATENT oFFlcE.

f FRANK II. ALDER, OF ST. LAMBERT, QUEBEC, CANADA, ASSIGNOR TO WESTERN ELEG- TRIC COMPANY7 INCORPORATED, OF :NEW YORK, .Nl Y., A CORPORATION OF NEW YORK.

Application :tiled January 10, 1923.

To all whom t may concern:

Be it known that L FRANK H. Annan, a subject of the King of Great Britain, residing at St. Lambert, in the Province of Quebec. Dominion of Canada, have invented certain new and useful Improvements in Telephone Instruments, of which the following is a full7 clear, concise, and exact description.

This invention relates to telephone substation apparatus; and its object is a switching mechanism therefor which will prevent the sending of false impulses and the causingv of Vpremature disconnections by incomplete movements of the switchhook in either direction, and which will be easy to install, to modify, and to maint-ain.

In accordance with one of the features of the invention,V there is providedvswitching mechanism comprising a rotatable shaft. operated by the switchhook lever against the action of a restoring spring, and operating the contact springs at a predetermined time in the switchhook movement through the medium of a lost motion switching means.

Other features of the invention relate to ldetails of the construction and combination of parts which render both the terminal plate supporting the contact springs, and the transmitter and switchhook supporting mechanism readily removable from the base and stem of a desk stand.

The drawing shows a telephone desk stand embodying the invention.

Fig. 1 is a side view of the desk stand with part of the covering removed to reveal the operating mechanism.

Fig. 2 is a bottom view of this mechanism.

Fig. V3 is a front view of the switchhook and its associated mechanism.

Figs. 4 to 6, respectively, show the switchhook in its normal position, in a considerably higher position, and at the completion of its upward swing; while Figs. 7 to 9 show they corresponding positions of the delayed action switching mechanism in the base of the desk stand.V

Fig. 10 shows the desk stand base and stem with the transmitter and switchhook assembly, the terminal plate, and the base plate removed.

Fig. 11 shows the transmitter and the switchhook mechanism removed from the desk stand stem.'

TELESE'HONE INSTRUMENT.

Serial No. 611,839.

Fig. 12 shows the terminal plate and spring pile-up removed from the desk stand ase.

F i g. 13 shows the base plate removed from the base.

Fig. 14 is a detail end view of the spring actuating mechanism.

The desk stand comprises a transmitter 5 mounted on a holder 6 which fits into the top of a stem 7 mounted on a base 8 which rests on a base plate 9. A nut 10 which holds the stem 7 on the base 8 also holds in place a washer 11 on which are lugs 14; which hold the base plate 9 in place, and lugs 16 which hold in place a terminal plate 25. A calling dial-19 is set into the forward surface of the base 9. A switchhook 12 is pivoted to the transmitter holder G at 13 and an extension 15 at its inner end is adapted to bear on a bent-over end 17 of a vertical shaft 18 in stem 7, so as to rotate the shaft upon the depression of the switchhook. Shaft 18 is held in place by projecting lugs 49 on a supporting plate 20, to the upper end of which the transmitter holder 6 is fastened. The end 17 of shaft 18 is caused to bear against the extension 15 on the switchhook 12 by a restoring coil spring 21 which is formed about the shaft with its upper end attached to a sleeve 22 about the shaft and its lower end attached to supporting plate 20. This spring may be tensioned for use under varying operating conditions by the adjustment of the sleeve 22 which has notches therein adapted to fit over the ends of a pin 23 in shaft 18. Supporting plate 2O is fastened to the terminal plate 25 by means of a single `screw 28 extending through the terminal plate into a lug (not shown) extending to the right from the foot of plate 20. Upon terminal plate 25 is spring pile-up 29 comprising contact springs 31, 32 and 33 which are arranged to close the line circuit when the receiver is removed from the switchhook, and to open it when the hook is fully depressed by the weight of the receiver.

Rotata'bly mounted on the lower end of the rod 18, which projects through an opening 37 in the terminal plate 25, and in proximity to spring 31 is a radial arm 34 to which is attached a vertical stud 35. Arm 34.- fits slidingly into a rectangular slot in a bent-over end Vof a radial plate 36 which is ixedly iaaava actuating the contact springs in response to the latter part of the switchhook moveinent.

9. In a telephone desk stand, a base, a stem, a terniinal plate in the base, a shaft in the stem projecting through the terminal plate, a switchhook to rotate the shaft in one direction, a coil spring to rotate it in the other direction, Contact springs on the lower side of the terminal plate, an outwardly projecting bend on one of the springs, a radial arm rotatably mounted on the foot of the shaft in operating relation to said outwardly projecting bend, means rigidly secured to the shaft to rotate the arm and operate the springs during the latter part of the rotation of the shaft in either direction, and means to prevent the operation of the arm except from the operation of the first mentioned means.

10. In a telephone desk stand, a base, a stem, a switchhook, a supporting plate in the stem, a shaft mounted on the supporting plate and rotatable in accordance with the switchhook nioveinent, a radial plate having a rectangular slot in a bent-over portion thereof ixedly mounted to the foot of the shaft and set slidable in said slot, a stud in the end thereof, a terminal plate in said base, an opening therein through which the bottom of the shaft carrying the radial member projects, a screw for attaching the terminal plate to the supporting plate, contact springs on the lower side of the terminal plate, an outwardly projecting bend on one of said springs, and means to maintain the pressure of the stud on said bend until the movement of the radial arm by the radial plate.

In Witness whereof, I hereunto subscribe my name this third day of January, A. D.

FRANK H. ALDER. 

